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Hubs, Gearboxes, Sprockets and Chains Can't find 'em, grind em - hubs and transmissions, problems and modifications to make you run smooth and trouble free

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  #1  
Old 03-25-2010, 12:06 PM
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outlawbiker outlawbiker is offline
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Default jackshaft bearings

anyone know what kind of high speed/high quality bearings that will last i should look for building a jackshaft? needle or sealed ball bearings, with or without grease zerks?

feel free to chime in if you got any advice or tips,thx
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Old 03-25-2010, 12:15 PM
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Default Re: jackshaft bearings

Jackshafts & Components BMI Karts and Supplies - Home

This is where I got mine. Hope this helps.
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  #3  
Old 03-26-2010, 10:51 PM
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Maxvision Maxvision is offline
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Default Re: jackshaft bearings

Go with sealed bearings since they need no lubricating and keep dirt out. Bearings should have ID of 5/8" for 5/8" shaft. OD doesn't matter since you're building your own mount.
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Old 03-28-2010, 02:35 PM
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Default Re: jackshaft bearings

anyone got an idea on what tooth count i should use on the jackshaft for a 20 inch rear end. im going to set it up basically, power from engine to shaft (need a tooth number), then shaft (need another tooth number for bike chain) to rear end.... im not worried about the pedals cause im not going to run the chain from the shaft up to the pedals with a freewheel,ive got a freewheel im just going to put on the very end of the jackshaft.

id like to know cause i have almost all the parts i need now, i just need to take another trip to the store for the gears,thx in advance!
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Old 03-28-2010, 07:24 PM
Gator Wrestler Gator Wrestler is offline
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Default Re: jackshaft bearings

If you will be driving the right side sprocket you will either need a freewheel on the crank or a dual freewheel on the wheel. Your crank and pedals will spin rather fast without this.( Unless you know something that I don't know.)

Tom
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Old 03-28-2010, 07:29 PM
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Default Re: jackshaft bearings

Quote:
Originally Posted by Gator Wrestler View Post
If you will be driving the right side sprocket you will either need a freewheel on the crank or a dual freewheel on the wheel. Your crank and pedals will spin rather fast without this.( Unless you know something that I don't know.)

Tom
i have a freewheel set up for the pedal crank back to the shaft,i just need to know what gears to buy for the shaft, obviously its going to be a different gear ratio than sick bike parts shifter kit because im on a 20 inch tire and im not using a pedal-sprocket freewheel on the crank,im using a freewheel on the jackshaft.
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Old 03-28-2010, 07:46 PM
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Default Re: jackshaft bearings

sorry for the double post,i wanted to attach a rough sketch of what im looking for.
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  #8  
Old 03-28-2010, 08:56 PM
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Default Re: jackshaft bearings

On your gear #1 I use a 18T. On the gear going to the rear wheel I have a 10T. My bike has a 24-1/2 OD wheel. My guess is that your #1 gear would be 16T or 14T.
Of course you do not need a freewheel as I have for gear #1(it is welded to work as a normal gear)
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Old 03-28-2010, 09:02 PM
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Default Re: jackshaft bearings

thank you! man,thats one nice set up on your OCC.hope mine turns out that way when its done. what do they call "gear 2" the one that drives the rear end, i dont know what to look for without a name for it. i cant find a specific number to match bike bike chain size. im told a #40 gear for the engine size will work,but what number is gear 2?
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Old 03-28-2010, 10:16 PM
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Default Re: jackshaft bearings

I happend to use a #41 sprocket. The pitch is 1/2". Bike chain and several other chains are the same pitch. I had to cut down the thickness of the sprocket teeth to accept bicycle chain.
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